Yesterday we noticed one of the animals had thrown up during the night. We knew it wasn't my daughters cat Zeus because he is locked in her room at night. And we knew it wasn't Sheena because she is trained to throw up in the tub. Daya is still learning so usually will throw up in the bathroom too and this was in the livingroom. Leaving Zen and Pax as the two it could be. They acted otherwise normal all day so I just kept an eye on them. They both ate normally and acted normally. Then this morning I got up and found more throw up and also that someone had vomited water. Then I picked up Zen. He cried out. I felt around his abdomen and he has a HUGE fist size lump in there. He was crying while I was doing that. He now can barely move without crying. Yet last night he was acting totally normal. I have to wait till 8am to call the vet and take him in. But I am really worried. What can come on so fast like that and cause such a huge lump so quickly that makes it so he can barely move. Even turning around to try and lay down has him crying. Please keep him in your thoughts.